Machine for cleaning and polishing tin sheets.



S. E. DIESCHER.

MACHINE FOR CLEANING AND POLISHING TIN SHEETS.

APPLICATION FILED APR.20. 1915.

Patented Oct. 5, 1915.

WITNESSES S. E. DIESCHER.

MACHINE FOR CLEANING AND POLISHING TIN SHEETS.

APPLICATION FILED APR- 20. 915. 1,155571 1 Patented Oct. 0, 1910.

2 SHEETSSHEET 2.

FIGE

WITNESSES Q) INVENTOR mmwmm 7/ W-MAM wil SAMUEL E. DIESCHER, or PITTSBURGH, PE NSYLVANIA.

MACHINE FOR CLEANING AND POLISHING TIN SHEETS.

Specification of Letters Patent.

Patented @ct. 5, 1915.

Application filed April 20, 1915. Serial No. $2,644.

To all whom it may concern Be it known that I, SAMUEL E. Drnscnnn, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvementsin Machines for Cleaning and Polishing Tin Sheets, of which improvements the following is a specification.

In cleaning and polishing tin sheets, it is the practice to pass the sheets through between a series of pairs of rolls formed of yielding material as disks formed of fiber.

.In some cases bran or other suitable material sheets prior'to their passage between the rolls, and bran is carried against the under surfaces by the lower rolls. In other forms of apparatus the rolls rotate in bran which is carried between them with the sheet. In both forms of apparatus one roll of each pair is rotated at a higher speed than the other and the rate of movement of the sheets is approximately the average of the "peripheral rateof both rolls, so that the surfaces of the sheets are subjected to a wiping action of the bran or of the bran and roll. It

1 has been foundthat this rubbing of the other when no sheet is passing between them,

surfacesfof the. rolls against the bran-covered surfaces of the sheets or against each wears the roll surfaces and that. such wear is irregular, producing irregularly disposed ridges or projections As the tinned sheets are verythin' and flexible they will. be distorted byEtheirregularsurfaces of the rolls and :in passin between a pair of rolls only POI'tlOIlSIOft e surfaces will be efiiciently acted on by the rolls and bran. Hence the sheets must be passed through four, six, or

more pairs of rolls to thoroughly remove all and transverse sections of a roll having magnetic means for increasing the feed efii clency of one of the rolls; Figs. 5 and 6 are transverse sections of other forms of rolls.

In the practice of the invention, the journalsof the rolls, 1, 1 2, 2 3, 3 4, 4*, etc.,

are mounted in bearing blocks 5 and 6 arranged in vertical slots or windows 7 formed in the sides of the frame of the machine. The blocks 6 rest in the lower ends of the windows, while the blocks 5 carrying the upper rolls are movable in the windows and are adapted to be forced down by screws 7 in order that the rolls may bear with suflicient pressure on the sheets passing between them. One roll, as 1, 2, Sand 4: of'each pair is formed of fibrous disks as has heretofore been the practice or otherwise constructed to form a soft, yielding surface which will not scratch or injure the tinned surfaces. The other roll as 1*, 2, 3 4 of each pair is formed of metal, preferably steel and has a uniform highly polished surface. As. the cleansing of the sheets will be effected by the fibrous or yielding rolls, the relative positions of the metal and soft rolls are reversed in each succeeding pair, so that both surfaces of the sheets will be operated on by both rolls, and hence it' is desirable that a machine should have. two, four, six or eight pairs of rolls so that both surfaces of thesheets will be uniformly treated.

Vhen sheets are passed between a pair of rolls the metal rolls will form firm, even bearing surfaces and prevent any distortion of the sheet and the soft rolls having uniform surfaces will operate uniformly on the whole surface of'the sheet and not in spots as in the machines now in general use.

.As the soft rolls will bear uniformly on the sheetsor on the smooth surface of the metal rolls'they will not be subjected to uneven wear, and their surface will remain uniform even if the density of said rolls arenot uniform. The soft roll of each pair will be driven at a higher speed than the metal roll and as the frictional engagement of the metal roll with the sheets will be greater than that of the soft roll when bran is interposed between the soft roll and sheet, the rate of movement of the sheets 'will be approximately the peripheral'rate of the metal roll. It is preferred that the peripheral rate of the successive metal rollshould be greater than that of the preceding metal roll so that when a sheet is in the bite of two adjacent pairs of rolls, it will be subjected to tension. While this increase of peripheral rate of succeeding rolls can be effected in many ways, it is preferred to accomplish this result by making each metal roll a little larger than the preceding roll, the journals of the metal rolls being driven. at the same rate.

The bran or other material is directed by the spout 8 into the hopper 9 which is hinged to and extends across the front end of the machine, and in the hopper is mounted screw 10 to distribute the material in the pocket formed by the end wall of the machine, the rolls 1 and 1, and a block 11 interposed between the end of the machine and the lower roll. On account of the nature of the surface of the Soft roll, some bran will be drawn in between it and the sheet. lVhen thus drawn into the bite of the roll, the bran will be compressed and rubbed along the sheet picking up the grease. As the pressure is released as thebran and sheet pass out of the bite, the bran will expand and operating like a sponge will pick up an additional quantity of the grease. It will be understood that the sheets while being cleansed are sufficiently hot to prevent the grease becoming hard.

Suitable means are employed for so filling the spaces between adjacent lower rolls as to retain a portion of the bran carried thereinto. While this is not necessary in front of a hard bottom roll, it is essential for a soft bottom roll. While other forms of filling pieces may be employed, it is preferred to use angle bars 12 for that purpose. These angle bars are supported by the bent lower ends of rods 13 adjustably secured to the sides of the machine.

On account of the nature of the .bran or other material being light and practically non-adherent to the smooth surfaces of the sheets and metal rolls, very little if any of it will be drawn in between the sheet and metal rolls, so that the latter will come into frictional contact with the sheets and impart to the sheet a movement approximately equal to the peripheral rate of the metal roll.

As sufiicient bran may pass into the bite of the metal rolls on the sheets, especially when the metal roll is on top, to lessen the grip of these rolls on the sheet, it is preferred to provide means whereby the frictional engagement of the metal rolls with the sheet will be rendered more effective. In Fig. 2 is shown a metal roll having its surface spirally grooved. In order that the movement of the sheets may not be diverted. the grooves 14 on one half of the roll have a pitch the reverse of that of the grooves 14 on the other half. As the bran on the sheet passes under the roll, the portions thereof adjacent to the grooves will be forced into the latter allowing the surface of the roll to come'into direct contact with the surface of the sheet over suflicient areas to insure the regular feed of the sheet. And further, as the sheets are very flexible, the pressure of the soft rolls in line with the grooves will cause a slight depression of the sheets into the grooves. This depression is not sufiicient to deform or injure the sheets, but will greatly increase the frictional engagement of the rolls with the sheets. In lieu of grooves, shallow recesses 15 may be formed in the surface of the metal roll as shown in Fig. 5, or the roll may be made hollow and holes 16 formed through its shell as shown in Fig. 6.

The engagement of the metal rolls with the sheets may be insured by magnetically attracting the sheets against the surface of the roll. As shown in Fig. 3 one end wall 17 of the roll is removable and the journal 18 on said end wall or head is made hollow. Through this journal is passed a hollow spindle 19 around which the journal can revolve. An angular bracket 20 has one arm secured to the inner end of the spindle, and on the horizontal arm of the bracket, which is substantially parallel with the axis of the rolls are secured electro-magnets 21, in such manner that their poles, a, b, will be close to the inner surface of the shell but not in contact therewith, as shown in Figs. 3 and 4. When employing magnetic means for increasing the feed efliciency of the metal rolls, the rim or shell of the latter Will be formed of non-magnetic material as aluminum, brass, etc.

It is characteristic of the invention described herein thatone of the rolls of each pair operates as a feed or carrier roll while the other roll operates to clean the surface of the sheet.

I claim herein as my invention 1. In a machine for cleaning and polishing coated metal sheets, the combination of a plurality of pairs of rolls, each pair consisting of a metal roll and a roll having a soft yielding surface, the peripheral speed of successive metal rolls bein increased.

2. In a machine for cleaning and polishing coated metal sheets, the combination of a plurality of pairs of rolls, each pair consisting of a metal roll and a roll having a soft yielding surface, means for driving one roll of each pair at a higher speed than the other roll, the metal rolls of the several pairs having the same journal speed, and each metal roll having a larger diameter than that of the preceding metal roll.

3. In a machine for cleaning and polishing coated metal sheets, the combination of a plurality of pairs of rolls, each air consisting of a metal roll and a roll aving a soft yielding surface, and one roll of each pair rotating at a higher speed than the other, the metal roll being providedwith means for rendering its frictional engagement with the sheet greater than that of the soft roll.

. 4. In a machine for cleaning and polishing coated metal'sheets, the combination of a plurality of pairs of rolls, each pair consisting of a metal roll and a roll having a soft yielding surface, and one roll of each pair rotating at a higher speed than the other, the metal roll having depressions in its surface.

5. In .a machine for cleaning and polishing coated metal sheets, the combination of a plurality of pairs of rolls, each pair consisting of a metal roll and a roll having a soft, yielding surface, the metal roll being provided with means for rendering its frictional engagement with the sheet greater than that of the soft roll.

6. In a machine for cleaning and polishing coated metal sheets, the combination of my hand. a

, SAML. E. DIESCHER.

Witnesses:

Anion A. TRILL, THos. B. JOYCE. 

